[mythtv-users] HVR-950q analog/NTSC capture has no sound

[James Miller]

On Fri, 10 Feb 2017, James Miller wrote:

> On Fri, 10 Feb 2017, R. G. Newbury wrote:
>
>> It's a little off the wall, but try plugging the two units into USB sockets 
>> *which are on different hubs*. Say, one on a rear socket and one on the 
>> front of the box. It is quite possible that the usb sub-system is getting 
>> confused about the number of units actually available *on one hub*, since 
>> they obviously have the same usb identifier.
>
> Thanks for the suggestion, Geoff. Sounds worth a try, though I'll have to do 
> some strategizing to implement it. First, I'm not sure this box has more than 
> one hub built in: this is a Liva X with only 3 USB ports. I suppose it might 
> nonetheless be worthwhile checking whether plugging one or other of the 
> HVR-950q's into a different USB port might have an effect.

Sure enough, by playing a bit of musical usb ports, I was able to cause 
the system to reboot/power-cycle with both tuners fully initialized and 
even in conformance with my udev rules (well, ok, I had to revise the alsa 
udev rules a bit). I'm reluctant to describe what worked since I don't 
really understand why it did; it will be unlikely to work in the way 
described on a different system and I'm also not certain it will continue 
to work here--though it has so far through 2 power cycles. What will 
happen if/when I will compile a new kernel, for example? I guess we'll 
have to see, should that eventuality transpire.

Anyway, I plugged the behaving HVR-950q into the port where the flirc 
formerly was inserted (directly into the Liva). I left the miscreant 
HVR-950q plugged into the external USB hub, though in a different port on 
that hub. On booting the computer, everything came up just as I'd been 
expecting, with no need for any unplugging/replugging of usb capture 
cards to get both operational and recognized by myth.

I thought enumerating and naming of usb devices might have become more 
coherent at this stage in the 21st century, but I guess it hasn't. Go 
figure. Back to boning up on slot-conflict resolutions for me.